<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
	<style>
	@media screen AND (min-width:768px){
		.body{
			background-color:red;
		}
	}
	</style>
	
</head>
<body>

	<div class="body">asdf</div>
	
</body>
</html>